1 //===-- WebAssemblyMCAsmInfo.cpp - WebAssembly asm properties -------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// This file contains the declarations of the WebAssemblyMCAsmInfo
11 /// properties.
12 ///
13 //===----------------------------------------------------------------------===//
14 
15 #include "WebAssemblyMCAsmInfo.h"
16 #include "Utils/WebAssemblyUtilities.h"
17 #include "llvm/ADT/Triple.h"
18 
19 using namespace llvm;
20 
21 #define DEBUG_TYPE "wasm-mc-asm-info"
22 
23 WebAssemblyMCAsmInfo::~WebAssemblyMCAsmInfo() = default; // anchor.
24 
25 WebAssemblyMCAsmInfo::WebAssemblyMCAsmInfo(const Triple &T,
26                                            const MCTargetOptions &Options) {
27   CodePointerSize = CalleeSaveStackSlotSize = T.isArch64Bit() ? 8 : 4;
28 
29   // TODO: What should MaxInstLength be?
30 
31   UseDataRegionDirectives = true;
32 
33   // Use .skip instead of .zero because .zero is confusing when used with two
34   // arguments (it doesn't actually zero things out).
35   ZeroDirective = "\t.skip\t";
36 
37   Data8bitsDirective = "\t.int8\t";
38   Data16bitsDirective = "\t.int16\t";
39   Data32bitsDirective = "\t.int32\t";
40   Data64bitsDirective = "\t.int64\t";
41 
42   AlignmentIsInBytes = false;
43   COMMDirectiveAlignmentIsInBytes = false;
44   LCOMMDirectiveAlignmentType = LCOMM::Log2Alignment;
45 
46   SupportsDebugInformation = true;
47 
48   // When compilation is done on a cpp file by clang, the exception model info
49   // is stored in LangOptions, which is later used to set the info in
50   // TargetOptions and then MCAsmInfo in LLVMTargetMachine::initAsmInfo(). But
51   // this process does not happen when compiling bitcode directly with clang, so
52   // we make sure this info is set correctly.
53   if (WebAssembly::WasmEnableEH || WebAssembly::WasmEnableSjLj)
54     ExceptionsType = ExceptionHandling::Wasm;
55 }
56